Pneumatic tube



1,625,460 Aprll 19, 1927. W. L FAIRCHILD PNEUMATIC TUBE Filed June 28. .1921

(III

AT TaJfNEY.

i Patented 1.9, '1.927,

\ .UNITED STATES Pi.TENT orr1 i wLrEn L. Fmcnrnn, or NEWYORK, N. Y. l

.PNIEUmrIc' TUBE.

' f application med :une as, 1921; serial Ney-181,059.

Thi'sinvention relates toja Inew and iinproved pneumatic tube, and while the 1n-.

vention is applicable to pneumatic tubes adapted for a variety of uses, .1t particularly relates tothe endless inner, tubes commonly lemployed in the casings of pneumatically tired veh' les. f

The invention disclosed in this application invsome of its aspects is a continuation in` vpart of my application filed September 3,..

1920, Serial No. 408,016. y i .One of the-objects of the invention 1s to provide a new and improved pneumatic tube whereinv the entire tube, including the part wherein' the Iends' 'of the tubular structure are united, and' the part through which the valve stem extends, possesses a degree of homogeneity hitherto unattained in pneumatiotubes. l

Another object ofv the invention is to provide a pneumatic tube of the above character, wherein that portion of the tube v through which the valve stem extends, is

exerted vupon this element will not tear or so strengthened and reinforced, that any possibility of leaks occurring between the f metal and the encircling rubberwall of the tube are practically eliminated.-

Another object of the invention 1s to provide a tube wherein themouln'ting of the valve stem is such that the usual strain loosen it from its mounting in the tube, the

, said mounting comprising a reinforced have shown'a preferre homogeneous wall, through which the valve stem extends...

Other objects 'and aims of the invention,- more `or less specific than those referred to above, will be in part obvious and in p art ointed out inthe course'of the following escripton of4 the elements, y combinations, arrangements of parts and applications of principles, .constituting the invention; and

l Figure`3 is a top` plan view of the structure shown in Figure 1.

, Figure 4 isa detail view in perspective of,

one end ofthe tube, showing. the reinforc-` ing means employed for the anchorage of the valve stem;- l v Figure 5 is a view similar to Figure. 4, but showing a slightlyfniodified form of construction.

Figure Gis a detail view, similar to Figure 1, but showing the parts after vulcanization.

l Referring now .to the drawing, wherein similarreference characters refer to similar parts throughout themseveral views thereof the reference numeral 1 illustrates one endof the tube, and 2 the opposite end thereof, which4 ends are fastened together to form a continuoustubular structure. i

At this 'point it may be noted that the.

are united, is preferably composed of raw rubber, that is tol say, rubber in the same condition it was when discharged-from a forming mold, said rubber containing the proper ingredient commonly employed in the production of such tubes, so that when the vulcanizing operation'is effected, the material isreduced to its finished state.

The reference numeral 3 denotes a ring which is also preferably composed of raw rubber, and-f4 denotes what I term a base patch, the latter being preferabl of oblong, curved form,'and composed o a fabric. vsuch as canvas, lboth sides of which have been rubberized, thatv is to say, coated with alayer of raw rubber of the same consistenc as that of the inner tube.

the preferred form of'embodiinentv of my invention, this base patch 4 is preferably f located between the ring?, and the united ends 1 and 2 of the tube, as clearly shown in Figure 1 of the drawin L.

The reference numeral. 5 lndicates a patch,

'preferably locatediexteriorly of the united ends 1 and 2 ofthe tube, said last'named patch bein alsol of oblong curved form and prefera ly composedvof'rubberized can-l vas, suchas has been described in connection. with-the base patchll. v

The 'pneumatic tube is provided near its end vwith an [aperture 6, through which the rvalve stein- 7 extends.. This valve stem is vmaterial of the tube before the en ds thereof provided with a head or. llange 8, which 'normally'lies -in engagementwith the inner lll Ehi

i, :is

lill

t tube, and the enterior patch ti.

abats the end l of the tube.

snrlace the ring fl, and a reduced portion ll, which entends' through apertures provided in the ring B, the base patch 4l, the a'loresaid aperture il ot the pneumatic Moulded upon the threaded portion ol the valve stein l is .nut l0, which is adapted to be scrcvved dov/nvrardljz1 upon said stenti, until engages 1with the outer surliace oit the patch 5, whereby 'this latter element, the end l ol the pneumatic tube, the base patch Ll, and the ring 3 are tightly clamped between said nut and the upper tace oil the dance or head d.

, The end 2 oithe pneumatic tube is inserted between the base patch l? and the anterior patch 5, so that preferably it slightly overlaps one end ol the ring 3, said end 2 and the end l of the pneumatic tube lying in abutting relation, as indicated by the dotted line ll-ll of lligures l and d.

llaving now described the construction, and the relation oi" the elements constituting rnjf improved pneumatic tube, l shall now proceed to describe the operation oi" assembljving or uniting said parts.

This operation is substantially as iollows: The o erator having provided himself with one o the base patches 4, and a ring 3, ine serts a valve stem through the openings provided in said-elements, and the valve stem is then inserted through the `opening pro-vI vided in the end of the tube l. This operation, o course, carries the ring and the base patch inside the end oi the tube i. The operator then lrneads the ring and tube so that the engaging surfaces of said tube,

ring, and the interposed base patch will bev united-by cohesion.r The base patch 5 is next positioned exteriorlv of the end `l, and

the parts again lrneadedrvhereby the enV gaging surl'aces of said last named base patch and the tube are united by cohesion.

it is, oi conrse, apparent that all the above described parts may be assembled, and all the en aging surfaces caused to cohere by a singe hneading operation. "When the above parts have been so assembled, and caused to cohere, the nut l0 ol the valve stern is screwed home, whereby all the parts are rmljr clamped together. n

Figure t illustrates the erfd l oi the tube with the last mentioned assembly.

The end 2 of the tube is next inserted between the patches 4 and 5 until its end When this has been done, the assembled parts are again lrneaded, so .that the end 2 oi the tube-is firmly united bjr cohesion to the' end l of the tube, and the rubberized surfaces of the patches d and 5. j

lt -will be understood, of course, that before the ends of the tube have been brought together, as shown, the operator has sprinlxled some talc, or similar powdered matei li.

nech 9 ol the valve stern entends, the layers being noch.. c

lin the drawing the various layers oi rualirnily vulcaniaed about the aforesaid terial in the vicinity oi the valve stem have been illustrated as being` separate elements. lt will be understood that this illustration is intended to illustrate these parts betere vulcaniaing, 'the line separating them being in the interest of clearness ot illustration,

rather than an accurate illustration of the aloresaid parts as they appear in the linished tube.

it will accordingly be seen that l have provided a construction Well adapted to at-` tain; among others, all the ends and objects above pointed out, in an exceedingly ehcient manner, llhe ends ol the tube are rmly joined together, and held in such condition by the reinforcing means, that that part of the tube adjacent the valve stem is anchored and reinforced not only by the ring 3, but by the exterior and interior patches, which co-operate with said ring 2l to provide a iirm anchoring tor said valve stem, and provide a iirin mhanical support ior the latter.

ln Figure biot the drawing l have shown a slightly modified iorm oi construction, in that the base patch d instead of being positioned between the ring 3` and the abutting ends ot the tube, is positioned `interiorlgv of the aforesaid ring, and is firmly united to the innersuriace ol said ring, and to the neighboring parts of the ends 1 and 2 of the tube. 'lhis structure is shown in my aforesaid pending ap lication.

lt will be understoo that various changes may be resorted to in the iorrn, construction and arrangement of `the several parte Without departing trom the spirit and scope oit niy invention, and hence l do not intend to be limited to the details herein shown and described except as they may be included in the claims.

lllaving thus described my invention what l claim as new and desire to secure by lietters latent is:

l. dn inner tube lor pneumatic vehicle tires having aA combined joint and valve structure comprising, a ring of rubber located vithin the tube and overlapping the joint, a stri ol rubberized material overlapping sai ring and joint, and a valveV piercing the ring, the strip and the tube, the said ring, strip and joint being vulcanized into a substantially homogeneous condition.

lill

llll

1,625,460 l w i v 2. An inne1` tube forv ypneumatic: vehicle tube, and a valve piercing the ring, the tires! having a combined joint and valve strips and the' tube, the said ring, strips Ystructure comprising, a Iring of rubber loand joint being vulcanized into-a substanl0 cated Vwithin the tube and overlapping the tially homogeneous condition.

` 5 joint, a pair of strips of rubberized`mate- In testimony whereof, i afix` my signaiiall overlapping said ring and joint, one of ture. l said stripsbeng within andone without the -WALTER L. FAJBCHILD. 

